So far those players that refreshes before the fight begins (i.e it shows the loading screen and just stays there), if I wait abit, when their game full refreshes, I know that I, as the plunderer, get my rewards, I don't need to fight and still counts as 1 plunder attempt, while they will go momentarily offline and still lose their rewards and will be considered plundered, so won't appear on the plunder list again for that particular convoy.